Check And Adjust Fan Belt Tension - Hitachi EX27U Operator's Manual

Check and Adjust Fan Belt Tension

--- every 100 hours (first time after 50 hours)
IMPORTANT: Loose fan belt tension may result in in-
sufficient battery charging, engine over-
heating as well as a rapid, abnormal belt
wear. Belts that are too tight, however,
can damage both bearings and belts.
Visually check the belt for wear. Replace if necessary.
Check fan belt tension by depressing the mid-point with the
thumb. Deflection must be A at a depressing force of ap-
proximately 98 N (10 kgf, 22 lbf).
A: 7 to 9 mm (between crank (1) and fan (2) pulley)
If tension is not within specifications, loosen bolts (4) for
adjusting plate (5) and alternator bracket. Move alternator
(3) until tension is correct. Tighten adjusting plate (5) with
bolts (4).
NOTE: When a new belt is installed, be sure to readjust
the tension after operating the engine for 3 to 5
minutes at slow idle speed to be sure that the
new belt is seated correctly.
MAINTENANCE
7-46
Deflection
A
1
EX27u, EX35u
Deflection
A
2
Push
1
EX50u
Push
2
M589-07-014
M571-07-021
5
4
3
M571-07-016